Sealing structure with combination of mechanical seal and piston ring
Through the combination of mechanical seal dynamic ring and static ring, combined with the design of multi-channel O-ring and piston seal ring, the leakage problem caused by friction of the existing seal structure is solved, and a more stable sealing effect is achieved and the life of the bearing is extended. .
Patent Information
- Application Number
- CN202421159762.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The existing sealing structure is prone to incomplete sealing due to friction after long-term use, resulting in leakage of media in the working chamber into the bearing cavity, resulting in the bearing jamming or shortening of life, and the lip seal is prone to deformation at high temperatures and lead to liquid leakage.
Using a sealing structure combining mechanical seal and piston ring, the sealing is carried out through the combination of mechanical sealing dynamic ring and static ring. The moving ring sputters lubricant to cool down during movement, and combines the design of multiple O-rings and piston seal rings to form Multi-layered sealing structure to prevent liquid from oozing out.
It effectively avoids liquid leakage, extends the life of the bearing, and prevents liquid leakage caused by high-temperature deformation through cooling mechanism, improving the stability and durability of the seal.
Smart Images
Figure CN222276945U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sealing structures, in particular to a sealing structure composed of a mechanical seal and a piston ring. Background Art
[0002] A dry screw vacuum pump is an exhaust device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump casing to produce suction and exhaust effects. The pair of screws (called the active rotor and the driven rotor respectively) are driven by synchronous gears. There is a certain gap between the screws, so when the pump is working, there is no friction between them, the operation is stable, the noise is low, and no lubricating oil is required in the working chamber. The active rotor and the driven rotor of the dry screw vacuum pump do not have lubricating oil in the working chamber during operation, but the bearings and synchronous gears on both sides still need lubricating oil for lubrication, so a sealing structure must be set between the working chamber and the bearing chamber to prevent the lubricating oil from communicating with the working chamber.
[0003] A general sealing structure uses four piston rings on the shaft sleeve. After the piston ring is installed in the groove of the shaft sleeve, the buckle is buckled to form a lower ring. After the piston ring is installed, it contacts the inner wall of the housing. The piston ring itself is made of wear-resistant material. When the shaft rotates, the piston ring rubs against the inner wall to isolate the working chamber from the bearing chamber. The piston ring structure will heat up and wear after long-term use, resulting in incomplete sealing, causing the medium in the working chamber to leak into the bearing lubrication chamber through the piston ring, causing the bearing to get stuck or the bearing life to be greatly shortened. Therefore, a sealing structure combining a mechanical seal and a piston ring is proposed to address the above problems. Utility Model Content
[0004] In order to make up for the deficiencies of the prior art, the utility model proposes a sealing structure combining a mechanical seal and a piston ring.
[0005] The technical solution adopted by the utility model to solve the technical problem is: a sealing structure of a mechanical seal and a piston ring combination, comprising a working chamber, the end of the working chamber is fixedly connected to a sealing structure, the end of the sealing structure is fixedly connected to a bearing chamber, the interior of the sealing structure is sleeved and connected to a shaft sleeve, the end of the inner wall of the shaft sleeve is sleeved and connected to a mechanical seal static ring, a mechanical seal dynamic ring is sleeved and connected between the piston sealing ring and the bearing chamber, and the inner wall of the shaft sleeve is sleeved and connected to a mechanical seal seat;
[0006] Preferably, the shaft sleeve further comprises a piston sealing ring, and the groove of the shaft sleeve is engaged with the piston sealing ring;
[0007] Preferably, the piston sealing ring further comprises: a male claw and a female claw, one end of the piston sealing ring is fixedly connected to the end of the male claw, the other end of the piston sealing ring is fixedly connected to the end of the female claw, and the male claw is engaged and connected to the female claw;
[0008] Preferably, the mechanical seal moving ring further comprises: an O-ring 1, and the groove of the mechanical seal moving ring is sleeved and connected to the O-ring 1;
[0009] Preferably, the mechanical seal seat comprises: O-ring three, O-ring four, and O-ring five. The groove sleeve at the bottom of the mechanical seal seat is connected to O-ring three, the groove sleeve at the left side of the mechanical seal seat is connected to O-ring four, and the groove sleeve at the right side of the mechanical seal seat is connected to O-ring five.
[0010] Preferably, the bearing cavity further comprises an oil deflector, and the rotating portion of the bearing cavity is fixedly connected to the middle portion of the oil deflector.
[0011] The utility model is beneficial in that:
[0012] 1. The utility model seals multiple leakage channels during use through the multiple combinations of the present invention, thereby preventing the liquid in the working chamber from leaking into the bearing chamber, causing the bearing to get stuck or the bearing life to be greatly shortened. In addition, compared with the existing lip seal technology, the utility model avoids the heat generated by the friction between the lip seal and the shaft, and the lip seal position is generally not designed with a heat dissipation device. At such a high temperature, the lip seal will be slightly deformed and cause leakage;
[0013] 2. The utility model performs the main sealing through the mechanical seal dynamic ring and the mechanical seal static ring. When the mechanical seal dynamic ring generates high temperature with the mechanical seal static ring during the operation, the mechanical seal dynamic ring cools down the splashing lubricating oil between the mechanical seal static ring and the mechanical seal dynamic ring to avoid excessive stability, which may cause deformation of the two and lead to leakage. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0016] Figure 2 for Figure 1 Schematic diagram of the internal structure;
[0017] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;
[0018] Figure 4 It is a structural schematic diagram of the piston sealing ring of the utility model.
[0019] In the figure:
[0020] 1. Working chamber; 2. Sealing structure; 21. O-ring 2; 3. Bearing chamber; 4. Bushing; 41. Piston sealing ring; 411. Male coupling claw; 412. Female coupling claw; 5. Mechanical seal static ring; 6. Mechanical seal dynamic ring; 61. O-ring 1; 7. Oil plate; 8. Mechanical seal seat; 81. O-ring 3; 82. O-ring 4; 83. O-ring 5. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] The following is combined with Figure 1-4 To further explain this application in detail,
[0023] The embodiment of the present application discloses a sealing structure of a mechanical seal and a piston ring combination, comprising a working chamber 1, a sealing structure 2 is fixedly connected to the end of the working chamber 1, a bearing chamber 3 is fixedly connected to the end of the sealing structure 2, a shaft sleeve 4 is sleeved and connected to the interior of the sealing structure 2, a mechanical seal static ring 5 is sleeved and connected to the end of the inner wall of the shaft sleeve 4, a mechanical seal dynamic ring 6 is sleeved and connected between the piston seal ring 41 and the bearing chamber 3, and a mechanical seal seat 8 is sleeved and connected to the inner wall of the shaft sleeve 4;
[0024] The shaft sleeve 4 further comprises a piston sealing ring 41, and the groove of the shaft sleeve 4 is engaged with the piston sealing ring 41;
[0025] The piston sealing ring 41 further includes: a male claw 411 and a female claw 412. One end of the piston sealing ring 41 is fixedly connected to the end of the male claw 411, and the other end of the piston sealing ring 41 is fixedly connected to the end of the female claw 412. The male claw 411 is engaged with the female claw 412.
[0026] The mechanical seal moving ring 6 further includes: an O-ring 1 61, and the groove of the mechanical seal moving ring 6 is sleeved and connected to the O-ring 1 61;
[0027] The mechanical seal seat 8 comprises: an O-ring three 81, an O-ring four 82, and an O-ring five 8283. The groove at the bottom of the mechanical seal seat 8 is sleeved to connect the O-ring three 81, the groove at the left side of the mechanical seal seat 8 is sleeved to connect the O-ring four 82, and the groove at the right side of the mechanical seal seat 8 is sleeved to connect the O-ring five 83;
[0028] The bearing cavity 3 further includes an oil deflector 7 , and the rotating portion of the bearing cavity 3 is fixedly connected to the middle portion of the oil deflector 7 .
[0029] Working principle: The rotor in the working chamber 1 is sleeved with a shaft sleeve 4 and a mechanical seal moving ring 6. The O-ring 1 61 arranged between the shaft sleeve 4 and the rotor plays a sealing role to prevent the liquid overflowing from the working chamber 1 from flowing out. A piston seal ring 41 is sleeved on the shaft sleeve 4, which cooperates with the O-ring 21 on the outer ring of the mechanical seal static ring 5 to play a sealing role. The mechanical seal seat 8 cooperates with the O-ring 3 81, O-ring 4 82, O-ring 5 83 to form a multi-layer protection to play a sealing role. The O-ring 3 81, O-ring 4 82 and O-ring 5 83 form a protective The protection can effectively prevent the liquid in the working chamber 1 from overflowing and flowing into the bearing chamber 3. From the direction of the working chamber 1, it passes through the piston sealing ring 41. This is the first sealing protection combination. The O-ring 21 arranged on the outer ring of the mechanical seal static ring 5 forms a sealing structure, which cooperates with the friction between the inner ring of the mechanical seal static ring 5 and the mechanical seal dynamic ring 6 to play a sealing role. Through the cooperation of the above parts, the following channels are sealed. Channel 1 is sealed by the sealing structure composed of O-ring 3 81, O-ring 4 82 and O-ring 5 83. Channel 2 is sealed by the mechanical seal seat 8 and =, O-ring The sealing structure formed by the second ring 21 and the inner ring of the mechanical seal static ring 5 is sealed, the channel three is sealed by the sealing structure formed by the outer ring of the sleeve 4 and the O-ring 1 61, and the channel four is sealed by the sealing structure formed by the piston sealing ring 41, the mechanical seal static ring 5 and the mechanical seal dynamic ring 6. Because the mechanical seal dynamic ring 6 moves relative to the mechanical seal static ring 5, this channel is initially sealed by the piston sealing ring 41, and the mechanical seal static ring 5 and the mechanical seal dynamic ring 6 constitute the main sealing structure. Because the mechanical seal dynamic ring 6 and the mechanical seal static ring 5 are in a relative motion relationship, the mechanical seal dynamic ring 6 and the mechanical seal static ring 5 are contact seals, and the mechanical seal static ring 5 and the mechanical seal dynamic ring 6 are in a completely fitted state, so that there is friction between the two. Due to the combination relationship between the mechanical seal dynamic ring 6 and the mechanical seal static ring 5, heat is generated during the friction between the two. At this time, the distance can drive the oil plate 7 to move through the bearing of the bearing cavity 3, and the oil plate 7 will splash the lubricating oil onto the mechanical seal dynamic ring 6 and the mechanical seal static ring 5, so that the lubricating oil cools down the heat generated by the two.
[0030] By sealing with multiple combinations of the present invention, multiple leakage channels during use are sealed to prevent the liquid in the working chamber 1 from leaking into the chamber 3, resulting in bearing jamming or a significant shortening of the bearing life. In addition, compared with the lip seal technology currently used, the lip seal avoids the heat generated by the friction between the lip seal and the shaft, and the lip seal position is generally not designed with a heat dissipation device. The lip seal relies on the lip material to withstand the high friction temperature of 300 to 400 degrees. At such a high temperature, the lip seal will be slightly deformed and leak. The main sealing is performed by the mechanical seal dynamic ring 6 and the mechanical seal static ring 5. When the mechanical seal dynamic ring 6 generates high temperature with the mechanical seal static ring 5 during the operation process, the mechanical seal dynamic ring 6 cools down the splashing lubricating oil between the mechanical seal static ring 5 and the mechanical seal dynamic ring 6, avoiding excessive stability and the leakage caused by deformation of both.
[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.
Claims
1. A sealing structure of a mechanical seal and a piston ring combination, comprising a working chamber (1), characterized in that: The end of the working chamber (1) is fixedly connected to a sealing structure (2), the end of the sealing structure (2) is fixedly connected to a bearing chamber (3), the interior of the sealing structure (2) is sleeved with a shaft sleeve (4), the end of the inner wall of the shaft sleeve (4) is sleeved with a mechanical sealing static ring (5), a mechanical sealing dynamic ring (6) is sleeved between the shaft sleeve (4) and the bearing chamber (3), and the inner wall of the shaft sleeve (4) is sleeved with a mechanical sealing seat (8).
2. The sealing structure of a mechanical seal and a piston ring combination according to claim 1, characterized in that: The shaft sleeve (4) also includes a piston sealing ring (41), and the groove of the shaft sleeve (4) is engaged with the piston sealing ring (41).
3. A sealing structure of a mechanical seal and a piston ring combination according to claim 2, characterized in that: The piston sealing ring (41) further comprises: a male claw (411) and a female claw (412); one end of the piston sealing ring (41) is fixedly connected to the end of the male claw (411); the other end of the piston sealing ring (41) is fixedly connected to the end of the female claw (412); the male claw (411) is snap-connected to the female claw (412).
4. The sealing structure of a mechanical seal and a piston ring combination according to claim 1, characterized in that: The mechanical seal dynamic ring (6) further comprises: an O-ring one (61); the groove of the mechanical seal dynamic ring (6) is sleeved and connected to the O-ring one (61).
5. The sealing structure of a mechanical seal and a piston ring combination according to claim 1, characterized in that: The mechanical seal seat (8) comprises: O-ring three (81), O-ring four (82), and O-ring five (83); the groove sleeve at the bottom of the mechanical seal seat (8) is connected to O-ring three (81), the groove sleeve at the left side of the mechanical seal seat (8) is connected to O-ring four (82), and the groove sleeve at the right side of the mechanical seal seat (8) is connected to O-ring five (83).
6. The sealing structure of a mechanical seal and a piston ring combination according to claim 1, characterized in that: The bearing cavity (3) further comprises an oil deflector (7), and the rotating portion of the bearing cavity (3) is fixedly connected to the middle portion of the oil deflector (7).